Sure it would have been easier to kiss chest to chest and they would, later, when they were done. But he was far from done, especially when Tony smiled like that and he felt it like a tug in the gut, Steve was wrapped around the other man's little finger, his thumb, heck all his fingers really. His stomach gave a hot flip and he slid his hands up from his hips to his shoulders and back again. "So, so beautiful," Steve murmured.
He slid one hand into Tony's hair, pulling his head back hard as he guided himself into him with the other. Steve took it slow, rocking in, pulling out, rocking in deeper because Tony was too tight and he had to push even though he was wonderfully slick. It felt so good, to be himself, to look down and see himself and Tony together and he finally bottomed out with a grunt. "Beautiful and mine," Steve said against his ear as he leaned over him, placing soft open mouthed kissed along his shoulder.